Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 789, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/789/2/L29
Keywords
cosmic background radiation; cosmology: observations; polarization
Categories
Funding
- National Natural Science Foundation of China [11033003, 11203024]
- Youth Innovation Promotion Association, CAS
- DoE [DE-AC02-76SF00515]
- KIPAC Kavli Fellowship
- DNRF Niels Bohr Professorship
- Science and Technology Facilities Council [ST/L000474/1, ST/J000507/1] Funding Source: researchfish
- STFC [ST/J000507/1, ST/L000474/1] Funding Source: UKRI
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We investigate possible imprints of galactic foreground structures such as the radio loops in the derived maps of the cosmic microwave background. Surprisingly, there is evidence for these not only at radio frequencies through their synchrotron radiation, but also at microwave frequencies where emission by dust dominates. This suggests the mechanism is magnetic dipole radiation from dust grains enriched by metallic iron or ferrimagnetic molecules. This new foreground we have identified is present at high galactic latitudes, and potentially dominates over the expected B-mode polarization signal due to primordial gravitational waves from inflation.
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